Machine



v(No Model.) 2'Sheets'-Sheet 1.

H. I'. PARSONS.

ROCK DRILLING lszrAcHINEIA 10.314,843- f9.1? muted 'Ma g. LLL.'

- H. 11.--PARS`0NS. ROGK DRILLING LIAQHINE.

(No Model.)

any 24, 1885.

VPatente M WITNESS S IJV'VEJVT R w? y W? 6L Y .By his .dtorneys pl MM/Me. A

UNITED- STATES PATENT OFFICE. 1

HENRY F. PARSONS, or -Nnw YORK, N. Y., AssIGNOR To THE PARSONS HAND ROCK DRILL COMPANY, or Naw YORK.

.RopcgK-DRILYLING MACHINE.

SPECIFICATION aiming part of Letters Patent No. 314,343, atea March 24, lees.

Application filed Septcmheril, 1852. (Xo model.)

To aZZ whom it may conoernf Beit known that I, HENRY F. PaRsoNs, a citizen Aof the United States of America, residing at the city of Newv York, in the county of New York and State of NewYork, have invented cert-'ain new and useful Improvements i'n Rock-Drilling .Machines, of which the following is a specification, reference being had therein tothe accompanying drawings.

Figure 1 represents a drill-machine constructed on principles` similar to those described in the two applications of Hugo Borchardt and myself, both of which were tiled September 12, 1881,. Fig. 2 represents a top view of the same. Fig. 3 represents a. sectional View showing certain detailsof construe--V tion. Fig. 4 represents a top view of the drillrod, this being also the form of thesocket in the end of the drill-holder into which the drillrod ts.

^ My present invention consists of certain improvements on the drill-machine described in said applications and the machine described in Letters Patent granted to me, dated October 25, 1881, and numbered 248,787. Said machines;r and especially the machines described/in the said applications, have given general satisfaction; but I have ascertained by .their use that the spring for operating the hammer, which is shown therein, (and which is represented in the accompanying drawings by the spring lettered 11,) in practical use is likely to. become broken by the continuallyrepeated compressions which it receives, and by the suddenness with which its expansion Vis arrestedand the vibrations or jars pro- 'duced thereby. The reaction of the metallic spring also detracts from its value in a roel;- drill by detracting .from the steadiness and positive force of the blow which it causes the hammer to strike.

I have made numerous eorts and experi- 'ments to overcome the diiiiculties referred to by altering the arrangement of the metallic spring, but without entire success untilI conceived my present invention.

My present inventlon consists, principally,

in combining with the helve of the hammer a rubber spring for the purpose of actuating the hammer; and experiment has shown that the use of this rubber spring is not open to sists in 'so forming the guides upon which theI operative portions of the machine are snp- .ported that said operative portions may be slid offof the guides before the supporting parts of the machine are set up, and the op- -erativc parts need not be placed in position.

on the supporting parts until`the latter have been set up. i

Another feature of my improvement consists in the method by which I attach the dr-ll to the drill-holder.'

I will now proceed to describe the machine.

A A. are the guides upon which the operative parts of the machine are fed forward as the drilling progresses.v These guides maybe held in any position by the adjustment of the supporting-legsBBB, one 'of which is represented as being removed in Fig. 1, so as not to obstruct the View of the other portions of the machine. These supporting-legs are adjustable lengthwise, and are connected with the upper portion of the guides by universal joints, so that they may be placed in any position which is required-bythe nature of the ground and the direction in which the drilling is to be performed.

guides A A in such a manner as to admit bf thepassage ofthe hammer and other mechanism between them. The forward ends ofthe guides vare connected by a similar curved cast- `ing, D, Which-isheldin position on the rock by an adjustable pin, d, which is pointed so as to take intothe surface of the rock. The guides. A A areiby preference made rectangular. The

CJI

The -leg B is attached to-V 'a curved casting, C, which connects the two frame to which the operative portions of the machine are attached has grooved arms (lettered b) situated -on each side of the barrelE, in which the drill-rod operates. The grooves in these arms'b are maderto accurately t upon the guides A A', and the guides A A ex- IOO tend continuously up past the curved piece C, as shown in Fig- 2, so that the operative parts of the machine, being supported by ythe 'grooved arms b, can' be slid 0E of the top of the guides without being Y intercepted by any of the supporting partsof the machine. This construction enables the, supporting parts of -the machine to be placed in position before the operative parts are attached, and the operative parts may then be attached by simply sliding the grooved arms b onto the'guides A Aat the top, and, as there is 'an open space between the bars both front and rear, there is no obstruction koiered by the guides to the passage of the bracket and operative parts from the top to near the bottom of the frame. The drill-holder F is free to reciprocate and revolve within the barrel E, though in theV form. of machine shown'in the drawings the drill is not lifted between 'each stroke of the hammer, as is the case with some of my machines. The lower end ofthe drill-holder is provided with a shoulder, f, between which and the lower end of the barrel E is'interposed a spiral spring for holding the drill in position against the rock. The drill-rod is circular in section, but is provided on four sides with rectangular wings which extend radially to a short distance, as shown in Fig. 4. 'In 3o the lower eudof the drill-holder F is formed ,.a socketcorresponding ih formwith the form ofthe top of the drill represented in Fig. 4.' This socket, it will be perceived, may be readily made by boring a hole in the bottomof the y 35 drill-holder of the shape and size of the body' of the drill,ax`1d then making two cross-cuts at right angles corresponding to the thickness of the ribs. The wings on`th'e sides of the drill prevent any`rotation of the drill in the drillo holder.` I have found. that when the drill is slid into the socket inthe bottom of the drillholder -no other means o f attachment is necessary in the form of machine shown, there beg,:as above remarked, no lifting of the drill betweenthe strokes of the hammer. 5

.Above the barrel of the machine there is secured to the drill-holder a Y circular ratchet,

G, which is caused to rotate intermittentlybetween .each stroke of the hammer by the 5c pawlsggf. Betweenthis circular ratchet and the 'top of the barrel E is placed a leaf-her washer, so that as the drill is forced forward by -the blows of the hammer the circular ratchetwheel comes in' contact with the leather washer T and forces the barrel of the machine forward upon theguidesA A', when necessary forfeed- A ingthex'nachine j :A -too .rapid feed of the machine'is prevented bythe adjustable friction-brake H, (shown in etail'in Fig. 3,) whichV bears upon each f thegnides A A", betweenrthe grooved Aprojections b, and which brake may be tightcnedor loosened by the set nnt h working upon: the 'mwsttachedtothebarrelllr Between the vset-nut hand the brake'H is interposed the HQ, -so as .fto produce :s

of the barrel is secured a bracket-arm, I, which projects outv laterallyY for the support of the main shalt e and the operative parts. This main shaft projects through the bracket I at right angles with the direction ofthe drill,and is reciprocated by the hand-levers e e".'

Secured to the shaft e is a casting, K,which is fully described in the above-mentioned applications. The pawls gag are pivoted to this casting a short distance from the center of the shaft e, so that each reciprocatio'n of the handlevers e' e causes the pawls gg to reciprocate, and, as the pawlsare arranged to take into the ratchet-wheel G on opposite sides of the drillholder, (one pawl being made' to pull and the otherto push,) the ratchet-wheel, and conse- .quently the drill-rod, is revolved the length of one tooth for each half-stroke of the Vlevers e e". The casting 'K also contains two wings, between which extends an arm of the three' armed lever k. This arm of the lever bis pierced near its end by a loose pin operated 'alternately by cams arranged at cach of its 90 ends on the inside of the wings of the casting K, so that for-each reciprocation of the handlevers e' e" the pin referred .to is raised and 5 dropped twice by the cams. The particular mechanism for doing this is fully described in the above-mentioned applications. The lever 7c, which is pivoted at L, will follow the motions of the pin. The helve m of the hammer isi-secured to another arm of the lever k, and the hammer is thus, by the cams on the casting K, raised and dropped twice for cach vibration of the hand-levers e e".-

Heretofore I have extended one arm of the lever k beyond the pivotl L, as shown in the drawings, and attached thereto a.- circular spring, a. so that when the hammer was raised l the spring a would be compressed, and when` j the hammer was released theforce of the spring Y would be utilized in d'riving the hammer against the drill-holder; but, as before stated, this .arrangement had certain disadvantages that are overcome by my improvement. which I prefer to 'apply in the following manner: I -extendthe bracket I upward to a considerable height above the heli-'e of the' hammer, as shown in Fig. 1, and attach to its upper' portion one end of a rubber spring, N. The other end of this rubberV springis secured-.tono Yarmrof the lever'l, to which the helve l ofgthe y hammer isalsosecured. By this arrangement no whenever thehammeris raisedby the motion ,Y of the lever 3k, Athe arm n of this lever, to whichl the spring and the .h elve are attached, is vibrated,so as to cause the expansion of the spring-N, andwhen the lever E is by .the cams-on the K, sores to hammer to strike'the drill-holder, the aux `ll'contracts with great speed and force produces a blow onthe hammer 'which is oxceedingly e'ective in drilling. YThe material. =of which Imakethe springlis' rubberndtlm r dimensions .which I prefer to-give it form or- -dinaig-sizeddrilling-machinosro yielding .pressure on the brake. To one sidev quarter incli'hy'ftwo andione-hn'lffiu trailverse section. I attach it at each end by passing throngh it a pin, as shown in Fig. 1. At

the upper end the pin is secured to a yoke,

P,-having a screw which through the bracket Landis provided with a set -nut on the opposite side of the bracket, whereby the tension of the springmaybe increased' or decreased at will. I have shown the method which I prefer for attachingthe rubber-spring;

1o but it is obvious that other means and arrangements maybe employed.

For the purpose of making the levers e e" adjustable around the shaft e at various angles with relation to the casting K, I- produce upon the outside faces of this casting, around the shaft e,serrations or teeth, as shown in Fig. 2, and outside of the casting on each side I place the pieces to which the levers e e" are secured. 'These pieces O O, on their inner sides, are

20 provided with flanges which have teeth or serrations to correspond with the teeth or serrations on the casting K. It-will thus beseen that by moving the pieces 0 O toward the end of the shaft e rtheir teeth or serrations will be disengaged from the casting K, and the levers may be adjusted to any position around the shaft, whereas when the pieces O 0 are moved up against the casting K their serrations'orl teeth .will engage with the casting, and auy 3o movement of the levers will carry with 'them Y the casting K. 1

.For the purpose of keeping the pieces O O Ain contact with the casting in operation, I

place between them and the flange or nut on '35 the ends of the shaft e spiral springs, as shown inzFig. 2. When it is desired to adjust these hand-levers e e into any new position, the

operator may pull the'pieces O O toward the ends of the shaft e and againstthe force of the 4o spiral springs, so as to 'disengage the teeth on Athepieces 0 0 from the 'casting and enable him to move them to any desired adjustment around the shaft. Inwhatever new position.

they are placed the spiral 'springs will force the teeth of cach'part to engage with those of the other.

What I-claim as new, and desire to secure by Letters Patent, isj. 1. The combination, in a'drilling-machine, 5o of the yoke P, -loosely secured to the bracket I,V Y. and the rubber springN, v one end of said spring to the yoke, said yoke having ascrew attached to the bracket, and provided with an adjusting-nut, substantially as 2. The combination, in a rock-'drilling ma# chine, with the drill-operating mechanism and its main shaft, of clutches on said main shaft composed of toothed members fixed to.v the shaft, and spring-pressed toothed members to 6o which 'the operating handles are secured, which springfprcssed members may engage the fixed members, so'as to bring the handles to any desired angle to the perpendicular, sub" stantiallyas described.` 65

3. The combination, in a rock-drilling lmachine, of a casting carrying the drill-lifting' cam provided with corrugations orteeth on the side around the center on which it turns, and alever for operating said cam, having correspond- 7o ing corrugations or teeth on its attached end, and means for pressing the corrugated faces together, substantially as described, and for thepurposes specified.

V4:. The combination, in a vdrilling-machine, 75 of a casting carrying the drill-lifting cam,hav. ing corrugations or teeth on its side around' the shaft on which it revolves, with the lever for operatingsaid cam, having corresponding corrugations or. teeth on its attached end, and 8o a spring surrounding the shaft, constructed and arranged to press the corrugationsof the lever into the corrugations of thecasting, substanv tially as and for the purpose specified.

5. A rock-drill framecomposed of parallel guide bars upon which. the drill carriage moves, and which are .connected by upper andvlower yokes, one of the yokes being curved or bentoutward and attached to t-he sides of the bars,.so as not to interfere vwith the removal 9o of the carriage, substantially asdescribed.

` 6. The framefor drilling-machines' herein described, consisting of the 'guide-barsA A, secured together by the connecting-bars C D, and having the upper bar curved to leave an open space between the guide-bars, and attached to the outer surfaces of the. bars `A, whereby a clear space is left for the ge of the bracket and operating parts into the machine and down toward the bottom ofthe guidcloo bars when the frame is in position for use, substantially as described.

A 7. The combination, with a drill having radial wings, of a drillholder provided .with a socket having a central hole of the shape and x05 sizel of the body of the drill,and cross-cuts extending entirely across the holder, substan- .tially as .described. being connected to the hammer and -the other `1n testimony whereof I afx my signature in presence of two witn. Y.

HENRY F. PARSONS. Witnesses: A rDans L H.D mscoL W. F. Hsreoon. 

